Phlegraean Fields red zone

[1] The Phlegraean Fields is an area of volcanic calderas west of the city of Naples.

[4] It entirely includes the comunes of Pozzuoli, Bacoli, Monte di Procida and Quarto, and part of the comunes of Giugliano in Campania, Marano di Napoli and Naples, with approximately 500,000 people to evacuate.

[5] The area is subjected to bradyseismic phenomena (the rise or fall of the ground), whose intensity is used as an indicator of the level of underground geological activity.

[6] The Protezione Civile provides specific alert levels according to the activity of the volcano, together with the National Institute of Geophysics and Volcanology.

[7] The evacuation plan is triggered by the declaration of the "alarm" state and it is expected to be completed in 72 hours.